Silvercrest earphones
This is my latest catch of earphones found and bought from Lidl several weeks ago The cost was relatively low at €5
For this price you get in a plastic package
The earphones with put in buds plus 1,2 m of cable length
Two spare plastic ear sockets , a fat set and a thin set
A nice bag for storing your buds
And a product guide of ca 50 pages in several languages including English Greek and Magyar (quite uncommon for models of this type !)
And 3 years of guarantee !!!
Now about their efficiency, that depends on how stiff you put the buds into your ears (for less or more bass)
Checking with Sandisk earphones , their sound is very low , close to 4-5 db and are more trebly
Same occurs with other bud type earphones as AKG 909 etc
But to my surprise using it with Sennheiser HD417 http://gadgets-zliangas.blogspot.gr/2012/10/sennheiser-hd417-headphones.html
Their sound seems very good very close to 417 with the same bandwidth , same bass excpt the middle tones which are higher !! (comparison between 417 and other buds yelds to same middle tone difference )
So verdict : 2/5 for their low audio output\
4/5 for their fidelity